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drm/i915: Make DP prepare/commit consistent with DP dpms 

Make sure the sequence of operations in all three functions makes
sense:

 1) The backlight must be off unless the screen is running
 2) The link must be running to turn the eDP panel on/off
 3) The CPU eDP PLL must be running until everything is off

Signed-off-by: Keith Packard <keithp@keithp.com>
hifive-unleashed-5.1
Keith Packard 2011-11-01 20:25:21 -07:00
parent 99ea7127a3
commit 21264c638b
1 changed files with 13 additions and 9 deletions
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22
drivers/gpu/drm/i915/intel_dp.c
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@ -1222,17 +1222,18 @@ static void intel_dp_prepare(struct drm_encoder *encoder)
{
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
ironlake_edp_backlight_off(intel_dp);
ironlake_edp_panel_off(intel_dp);
/* Wake up the sink first */
ironlake_edp_panel_vdd_on(intel_dp);
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
intel_dp_link_down(intel_dp);
ironlake_edp_panel_vdd_off(intel_dp, false);
/* Make sure the panel is off before trying to
* change the mode
*/
ironlake_edp_backlight_off(intel_dp);
intel_dp_link_down(intel_dp);
ironlake_edp_panel_off(intel_dp);
}
static void intel_dp_commit(struct drm_encoder *encoder)
@ -1264,16 +1265,20 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
uint32_t dp_reg = I915_READ(intel_dp->output_reg);
if (mode != DRM_MODE_DPMS_ON) {
ironlake_edp_backlight_off(intel_dp);
ironlake_edp_panel_off(intel_dp);
ironlake_edp_panel_vdd_on(intel_dp);
if (is_edp(intel_dp))
ironlake_edp_backlight_off(intel_dp);
intel_dp_sink_dpms(intel_dp, mode);
intel_dp_link_down(intel_dp);
ironlake_edp_panel_off(intel_dp);
if (is_edp(intel_dp) && !is_pch_edp(intel_dp))
ironlake_edp_pll_off(encoder);
ironlake_edp_panel_vdd_off(intel_dp, false);
if (is_cpu_edp(intel_dp))
ironlake_edp_pll_off(encoder);
} else {
if (is_cpu_edp(intel_dp))
ironlake_edp_pll_on(encoder);
ironlake_edp_panel_vdd_on(intel_dp);
intel_dp_sink_dpms(intel_dp, mode);
if (!(dp_reg & DP_PORT_EN)) {
@ -1281,7 +1286,6 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
ironlake_edp_panel_on(intel_dp);
ironlake_edp_panel_vdd_off(intel_dp, true);
intel_dp_complete_link_train(intel_dp);
ironlake_edp_backlight_on(intel_dp);
} else
ironlake_edp_panel_vdd_off(intel_dp, false);
ironlake_edp_backlight_on(intel_dp);